A word of warning, though

A word of warning, though: Many interviewers have heard this
supposed weakness so many times that you might risk coming off
as unoriginal if you use it. Here are two other possible answers to
this question:

ANSWER: Some people have asked me why it is that I try so hard to get along with everyone. I just like to feel that we’re all working in a team environment where people need to like and respect each other. I think
that when a team really gets along well, they’re also more productive.

ANSWER: I’ve been told a few times that I’m just too much of a perfectionist. Yes, it’s true. I do make it a practice of checking my work at least once or twice to make sure that it’s absolutely accurate. When working in a medical lab, I have to stay on top of every detail. If the cost of knowing tests have been done correctly takes a fraction of a minute more, that’s a small price to pay when someone’s life could depend on it.

Even if the preceding answers sound a little twisted, they are better than bringing up real issues like not being able to follow directions or having hostile relations with coworkers. If you bring up weaknesses of that nature, you are surely going to invite the interviewer to probe further into the problem.

Taken from : Fearless Interviewing - How To Win The Job